yahoo-eng-team team mailing list archive

[OpenStack Infra <1660090@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/426531
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=29490ab1a913e0f4aa68fab8222afeb90ccf5def
Submitter: Jenkins
Branch:    master

commit 29490ab1a913e0f4aa68fab8222afeb90ccf5def
Author: David Medberry <openstack@xxxxxxxxxxxx>
Date:   Sat Jan 28 17:32:17 2017 -0700

    Explain how allow_resize_to_same_host is useful
    
    With the ServerGroupAffinityFilter enabled, you need to also set
    allow_resize_to_same_host to True. Mentioning this in the
    description for that config setting.
    
    ServerGroupAffinity is a scheduler setting that places all
    servers with the group on the same host. (It is the opposite
    of AntiAffinity that PREVENTS them from being on the same
    host.) Consequently, if you try to resize a server that is
    in an Affinity group (ie, it is affined) it will fail as the
    current rules IMMEDIATELY remove the current server from
    the list of possible scheduling targets (unless you have enabled
    "allow_resize_to_same_host".) Since none of the other servers
    can be candidates because of the Affinity rule, the resize
    fails entirely.
    
    Change-Id: I77a90ffdfe465d99ee8596375430ee960048d566
    Closes-Bug: #1660090


** Changed in: nova
       Status: In Progress => Fix Released

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1660090

Title:
  add better explanation to allow_resize_to_same_host

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Currently the config setting:
  allow_resize_to_same_host

  only mentions:
  Allow destination machine to match source for resize. Useful when
  testing in single-host environments. By default it is not allowed
  to resize to the same host. Setting this option to true will add
  the same host to the destination options.

  However, this setting is NECESSARY to resize hosts in an affined
  server group via ServerGroupAffinityFilter

  and while this is a cosmetic setting, it is likely contributing extra
  work to anyone who allows this filter and generally allows resizing.
  This was tripped across when doing Trove testing (which allows
  affinity or a-a for a db cluster.)

  An issue (cosmetically) in at least Liberty through master (Ocata).

To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1660090/+subscriptions